mirror of
https://github.com/Waujito/youtubeUnblock.git
synced 2025-01-03 04:49:58 +00:00
Optimize memory usage
This commit is contained in:
Vadim Vetrov
parent
d2985e80bd
commit
8b4b14bddf
117
youtubeUnblock.c
117
youtubeUnblock.c
@ -217,8 +217,8 @@ static int ipv4_frag(struct pkt_buff *pktb, size_t payload_offset,
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nfq_ip_set_checksum(f1_hdr);
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nfq_ip_set_checksum(f2_hdr);
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*frag1 = pktb_alloc(AF_INET, buff1, f1_dlen, 256);
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*frag2 = pktb_alloc(AF_INET, buff2, f2_dlen, 256);
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*frag1 = pktb_alloc(AF_INET, buff1, f1_dlen, 0);
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*frag2 = pktb_alloc(AF_INET, buff2, f2_dlen, 0);
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return 0;
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}
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@ -290,8 +290,8 @@ static int tcp4_frag(struct pkt_buff *pktb, size_t payload_offset,
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nfq_tcp_compute_checksum_ipv4(s1_tcph, s1_hdr);
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nfq_tcp_compute_checksum_ipv4(s2_tcph, s2_hdr);
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*seg1 = pktb_alloc(AF_INET, buff1, s1_dlen, 256);
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*seg2 = pktb_alloc(AF_INET, buff2, s2_dlen, 256);
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*seg1 = pktb_alloc(AF_INET, buff1, s1_dlen, 0);
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*seg2 = pktb_alloc(AF_INET, buff2, s2_dlen, 0);
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return 0;
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}
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@ -418,25 +418,23 @@ struct verdict {
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* data Payload data of TCP.
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* dlen Length of `data`.
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*/
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static struct verdict process_tls_data(
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struct pkt_buff *pktb,
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struct tcphdr *tcph,
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uint8_t *data,
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static struct verdict analyze_tls_data(
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const uint8_t *data,
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uint32_t dlen)
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{
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struct verdict vrd = {0};
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size_t i = 0;
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uint8_t *data_end = data + dlen;
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const uint8_t *data_end = data + dlen;
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while (i + 4 < dlen) {
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uint8_t *msgData = data + i;
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const uint8_t *msgData = data + i;
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uint8_t tls_content_type = *msgData;
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uint8_t tls_vmajor = *(msgData + 1);
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uint8_t tls_vminor = *(msgData + 2);
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uint16_t message_length = ntohs(*(uint16_t *)(msgData + 3));
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uint8_t *message_length_ptr = msgData + 3;
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const uint8_t *message_length_ptr = msgData + 3;
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if (i + 5 + message_length > dlen) break;
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@ -445,7 +443,7 @@ static struct verdict process_tls_data(
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goto nextMessage;
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uint8_t *handshakeProto = msgData + 5;
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const uint8_t *handshakeProto = msgData + 5;
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if (handshakeProto + 1 >= data_end) break;
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@ -454,9 +452,9 @@ static struct verdict process_tls_data(
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if (handshakeType != TLS_HANDSHAKE_TYPE_CLIENT_HELLO)
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goto nextMessage;
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uint8_t *msgPtr = handshakeProto;
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const uint8_t *msgPtr = handshakeProto;
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msgPtr += 1;
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uint8_t *handshakeProto_length_ptr = msgPtr + 1;
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const uint8_t *handshakeProto_length_ptr = msgPtr + 1;
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msgPtr += 3 + 2 + 32;
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if (msgPtr + 1 >= data_end) break;
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@ -476,15 +474,15 @@ static struct verdict process_tls_data(
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if (msgPtr + 2 >= data_end) break;
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uint16_t extensionsLen = ntohs(*(uint16_t *)msgPtr);
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uint8_t *extensionsLen_ptr = msgPtr;
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const uint8_t *extensionsLen_ptr = msgPtr;
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msgPtr += 2;
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uint8_t *extensionsPtr = msgPtr;
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uint8_t *extensions_end = extensionsPtr + extensionsLen;
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const uint8_t *extensionsPtr = msgPtr;
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const uint8_t *extensions_end = extensionsPtr + extensionsLen;
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if (extensions_end > data_end) break;
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while (extensionsPtr < extensions_end) {
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uint8_t *extensionPtr = extensionsPtr;
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const uint8_t *extensionPtr = extensionsPtr;
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if (extensionPtr + 4 >= extensions_end) break;
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uint16_t extensionType =
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@ -493,7 +491,7 @@ static struct verdict process_tls_data(
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uint16_t extensionLen =
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ntohs(*(uint16_t *)extensionPtr);
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uint8_t *extensionLen_ptr = extensionPtr;
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const uint8_t *extensionLen_ptr = extensionPtr;
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extensionPtr += 2;
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@ -503,15 +501,15 @@ static struct verdict process_tls_data(
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if (extensionType != TLS_EXTENSION_SNI)
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goto nextExtension;
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uint8_t *sni_ext_ptr = extensionPtr;
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const uint8_t *sni_ext_ptr = extensionPtr;
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if (sni_ext_ptr + 2 >= extensions_end) break;
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uint16_t sni_ext_dlen = ntohs(*(uint16_t *)sni_ext_ptr);
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uint8_t *sni_ext_dlen_ptr = sni_ext_ptr;
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const uint8_t *sni_ext_dlen_ptr = sni_ext_ptr;
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sni_ext_ptr += 2;
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uint8_t *sni_ext_end = sni_ext_ptr + sni_ext_dlen;
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const uint8_t *sni_ext_end = sni_ext_ptr + sni_ext_dlen;
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if (sni_ext_end >= extensions_end) break;
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if (sni_ext_ptr + 3 >= sni_ext_end) break;
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@ -563,46 +561,34 @@ static int process_packet(const struct packet_data packet) {
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}
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const int family = AF_INET;
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const uint8_t *raw_payload = packet.payload;
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size_t raw_payload_len = packet.payload_len;
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struct pkt_buff *pktb = pktb_alloc(
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family,
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packet.payload,
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packet.payload_len,
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256
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);
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if (raw_payload == NULL) return MNL_CB_ERROR;
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if (pktb == NULL) {
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perror("pktb_alloc");
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return MNL_CB_ERROR;
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}
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const struct iphdr *ip_header = (const void *)raw_payload;
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struct iphdr *ip_header = nfq_ip_get_hdr(pktb);
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if (ip_header->version != IPPROTO_IPIP || ip_header->protocol != IPPROTO_TCP)
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goto fallback;
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if (ip_header == NULL) {
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perror("get_ip_hdr");
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goto error;
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}
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int iph_len = ip_header->ihl * 4;
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if (ip_header->protocol != IPPROTO_TCP) {
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const struct tcphdr *tcph = (const void *)(raw_payload + iph_len);
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if ((const uint8_t *)tcph + 20 > raw_payload + raw_payload_len) {
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printf("LZ\n");
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goto fallback;
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}
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if (nfq_ip_set_transport_header(pktb, ip_header)) {
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perror("set_transport_header\n");
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int tcph_len = tcph->doff * 4;
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if ((const uint8_t *)tcph + tcph_len > raw_payload + raw_payload_len) {
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printf("LZ\n");
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goto fallback;
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}
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struct tcphdr *tcph = nfq_tcp_get_hdr(pktb);
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if (tcph == NULL) {
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fprintf(stderr, "tcp_get_hdr\n");
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goto fallback;
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}
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int data_len = ntohs(ip_header->tot_len) - iph_len - tcph_len;
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const uint8_t *data = (const uint8_t *)(raw_payload + iph_len + tcph_len);
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void *data = nfq_tcp_get_payload(tcph, pktb);
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ssize_t data_len = nfq_tcp_get_payload_len(tcph, pktb);
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struct verdict vrd =
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process_tls_data(pktb, tcph, data, data_len);
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struct verdict vrd = analyze_tls_data(data, data_len);
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verdnlh = nfq_nlmsg_put(buf, NFQNL_MSG_VERDICT, config.queue_num);
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nfq_nlmsg_verdict_put(verdnlh, packet.id, NF_ACCEPT);
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@ -617,22 +603,25 @@ static int process_packet(const struct packet_data packet) {
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fprintf(stderr, "WARNING! Google video packet is too big and may cause issues!\n");
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#endif
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}
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// GSO may turn kernel to not compute tcp checksum.
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// Also it will never be meaningless to ensure the
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// checksum is right.
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nfq_tcp_compute_checksum_ipv4(tcph, ip_header);
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nfq_nlmsg_verdict_put(verdnlh, packet.id, NF_DROP);
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struct pkt_buff *frag1;
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struct pkt_buff *frag2;
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nfq_nlmsg_verdict_put(verdnlh, packet.id, NF_DROP);
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#ifdef USE_TCP_SEGMENTATION
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size_t ipd_offset = vrd.sni_offset;
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size_t mid_offset = ipd_offset + vrd.sni_len / 2;
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struct pkt_buff *pktb = pktb_alloc(
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family,
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packet.payload,
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packet.payload_len,
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0);
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if (tcp4_frag(pktb, mid_offset, &frag1, &frag2) < 0) {
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perror("tcp4_frag");
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pktb_free(pktb);
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goto fallback;
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}
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@ -642,8 +631,15 @@ static int process_packet(const struct packet_data packet) {
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pktb_free(frag1);
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pktb_free(frag2);
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pktb_free(pktb);
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#else
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// TODO: Implement compute of tcp checksum
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// GSO may turn kernel to not compute the tcp checksum.
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// Also it will never be meaningless to ensure the
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// checksum is right.
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// nfq_tcp_compute_checksum_ipv4(tcph, ip_header);
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size_t ipd_offset = ((char *)data - (char *)tcph) + vrd.sni_offset;
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size_t mid_offset = ipd_offset + vrd.sni_len / 2;
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mid_offset += 8 - mid_offset % 8;
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@ -666,7 +662,7 @@ static int process_packet(const struct packet_data packet) {
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}
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/*
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if (pktb_mangled(pktb)) {
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#ifdef DEBUG
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printf("Mangled!\n");
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@ -674,6 +670,7 @@ static int process_packet(const struct packet_data packet) {
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nfq_nlmsg_verdict_put_pkt(
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verdnlh, pktb_data(pktb), pktb_len(pktb));
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}
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*/
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if (mnl_socket_sendto(config.nl, verdnlh, verdnlh->nlmsg_len) < 0) {
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perror("mnl_socket_send");
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@ -681,14 +678,11 @@ static int process_packet(const struct packet_data packet) {
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goto error;
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}
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pktb_free(pktb);
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return MNL_CB_OK;
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fallback:
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pktb_free(pktb);
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return fallback_accept_packet(packet.id);
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error:
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pktb_free(pktb);
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return MNL_CB_ERROR;
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}
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@ -708,8 +702,6 @@ static int queue_cb(const struct nlmsghdr *nlh, void *data) {
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return MNL_CB_ERROR;
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}
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ph = mnl_attr_get_payload(attr[NFQA_PACKET_HDR]);
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packet.id = ntohl(ph->packet_id);
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@ -723,9 +715,6 @@ static int queue_cb(const struct nlmsghdr *nlh, void *data) {
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return fallback_accept_packet(packet.id);
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}
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uint32_t skbinfo = attr[NFQA_SKB_INFO]
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? ntohl(mnl_attr_get_u32(attr[NFQA_SKB_INFO])) : 0;
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if (attr[NFQA_MARK] != NULL) {
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// Skip packets sent by rawsocket to escape infinity loop.
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if (ntohl(mnl_attr_get_u32(attr[NFQA_MARK])) ==
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